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Step * of Lemma rat-midpoint_wf

∀[a,b:ℤ × ℕ+].  (rat-midpoint(a;b) ∈ ℤ × ℕ+)
BY
{ ProveWfLemma }

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Latex:

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Latex:
\mforall{}[a,b:\mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{}].    (rat-midpoint(a;b)  \mmember{}  \mBbbZ{}  \mtimes{}  \mBbbN{}\msupplus{})


By

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Latex:
ProveWfLemma

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